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The presidency of William Henry Harrison, who died 31 days after taking office in 1841, was the shortest in American history. [ 6 ] Franklin D. Roosevelt served the longest, over twelve years, before dying early in his fourth term in 1945. He is the only U.S. president to have served more than two terms. [ 7 ]
e. In chemistry, pH (/ piːˈeɪtʃ / pee-AYCH), also referred to as acidity or basicity, historically denotes " potential of hydrogen " (or "power of hydrogen"). [ 1 ] It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions (solutions with higher concentrations of hydrogen (H+) ions) are ...
Trimesic acid, also known as benzene-1,3,5-tricarboxylic acid, is an organic compound with the formula C 6 H 3 (CO 2 H) 3. It is one of three isomers of benzenetricarboxylic acid . [ 3 ] A colorless solid, trimesic acid has some commercial value as a precursor to some plasticizers .
The gamma function is an important special function in mathematics. Its particular values can be expressed in closed form for integer and half-integer arguments, but no simple expressions are known for the values at rational points in general. Other fractional arguments can be approximated through efficient infinite products, infinite series ...
PSA TU engine. The EC family of small inline-four piston engines are largely based on its predecessor, the TU family, for China, North Africa and Latin America. They are appeared in 2012 and used in cars such as Peugeot 301 and Citroën C-Elysée. EC5 — 1.6 L 115 PS (85 kW; 113 hp). EC8 — 1.8 L 136 PS (100 kW; 134 hp).
Fibonacci sequence. In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . The sequence commonly starts from 0 and 1, although some authors start the sequence from 1 and 1 or sometimes ...
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